. >> when we come back at 6:00 the president draws a new line in the sand on america's debt ceiling. what happens if the limit isn't lifted? who will feel it first? >> a gun buy back. it's not just weapons they're after. a poll revealing hows&á america feels about gun control. >> and the internet hero who took his life in the middle of a new campaign for social justice, online. stay with us. the ne hmm, it says here that cheerios helps lower cholesterol as part of a heart healthy diet. that's true. ...but you still have to go to the gym. ♪ the one and only, cheerios ...and now... you! [ giggles ] ♪ the one and only, cheerios >>> president obama insists he will not negotiate with white house rinz over the debt keeling and says the full faith and credit of the united states will not be a bargaining chip. abc 7 news mark matthews is here with the challenge that the president is facing on this. >> the president says concept understand.jjw that is not what we found and the challenge facing the president is one that he began to address this morning. president told reporters raising th